<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>

</head>
<body>
  <div id="app">
    <child :message="parent">传变量</child>
    <child message="parent">传值</child>
  </div>
</body>
<script>
  Vue.component('child', {
    props: ['message'],
    template: '<span>{{message}}</span>'
  })
  new Vue({
    el: '#app',
    data: {
      parent: 'parentabcd'
    }
  })
</script>
</html>